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Charset.scala
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Charset.scala
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/*
* Copyright 2013 http4s.org
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Copyright 2013-2020 http4s.org
*
* SPDX-License-Identifier: Apache-2.0
*
* Based on https://github.com/spray/spray/blob/v1.1-M7/spray-http/src/main/scala/spray/http/HttpCharset.scala
* Copyright (C) 2011-2012 spray.io
* Based on code copyright (C) 2010-2011 by the BlueEyes Web Framework Team
*/
package org.http4s
import cats._
import org.http4s.util._
import java.nio.charset.StandardCharsets
import java.nio.charset.{Charset => NioCharset}
import java.util.HashMap
import java.util.Locale
import scala.jdk.CollectionConverters._
// scalafix:off Http4sGeneralLinters; bincompat until 1.0
final case class Charset private[http4s] (nioCharset: NioCharset) extends Renderable {
def withQuality(q: QValue): CharsetRange.Atom = CharsetRange.Atom(this, q)
def toRange: CharsetRange.Atom = withQuality(QValue.One)
def render(writer: Writer): writer.type = writer << nioCharset.name
}
object Charset extends CharsetCompanionPlatform {
implicit val catsInstancesForHttp4sCharset: Hash[Charset] with Order[Charset] =
new Hash[Charset] with Order[Charset] {
override def hash(x: Charset): Int =
x.hashCode
override def compare(x: Charset, y: Charset): Int =
// Using Comparable
x.nioCharset.compareTo(y.nioCharset)
}
val `US-ASCII`: Charset = Charset(StandardCharsets.US_ASCII)
val `ISO-8859-1`: Charset = Charset(StandardCharsets.ISO_8859_1)
val `UTF-8`: Charset = Charset(StandardCharsets.UTF_8)
val `UTF-16`: Charset = Charset(StandardCharsets.UTF_16)
val `UTF-16BE`: Charset = Charset(StandardCharsets.UTF_16BE)
val `UTF-16LE`: Charset = Charset(StandardCharsets.UTF_16LE)
// Charset.forName caches a whopping two values and then
// synchronizes. We can prevent this by pre-caching all the lookups
// that will succeed.
private val cache: HashMap[String, NioCharset] = {
val map = new HashMap[String, NioCharset]
for {
cs <- availableCharsets
name <- cs.name :: cs.aliases.asScala.toList
} map.put(name.toLowerCase(Locale.ROOT), cs)
map
}
def fromNioCharset(nioCharset: NioCharset): Charset = Charset(nioCharset)
def fromString(name: String): ParseResult[Charset] =
cache.get(name.toLowerCase(Locale.ROOT)) match {
case nioCharset: NioCharset => Right(Charset.apply(nioCharset))
case null => Left(ParseFailure("Invalid charset", s"$name is not a supported Charset"))
}
}